Price::updateAction

public function updateAction(int $id, array $fields): ?array
{
	$price = $this->get($id);
	if (!$price)
	{
		$this->addError(new Error('Price is not exists'));

		return null;
	}

	$fields = array_merge($price, $fields);
	return $this->modifySingleProductPrice($fields);
}